I have a Book table that has a column for stocks count.For example the beginning stocks of a certain book is 100.

BOOKS
book_id | book_stocks
1       | 100

when i run this code it will output '100'.

$book = Book::where('book_isbn','=',$credentials['book_isbn'])->get();
        foreach ($book as $b) {
            echo $b->book_stocks;
        }

then a part of my code will decrement this stock once a user reserves a book. here's the code.

Book::where('book_isbn','=',$credentials['book_isbn'])->decrement('book_stocks');

when i check my database it now becomes

BOOKS
book_id | book_stocks
1       | 99

but when i run this code again.

$book = Book::where('book_isbn','=',$credentials['book_isbn'])->get();
        foreach ($book as $b) {
            echo $b->book_stocks;
    }

the output is still '100'. I don't know where it saves that old stock value. I'm sure with my database connection, i tried to clear cache etc. do anyone knows the reason behind this? Thanks in advance